Burette holder



BURETTE HOLDER Filed July 3, 1946 final! I l Til W H m BY ATTORNEY Patented Mar. 7, 1950 BURETTE HOLDER Guy H. Burrell, Pittsburgh, Pa., assignor to Burrell Technical Supply Company, Pittsburgh, Pin, a corporation of Pennsylvania Application July 3, 1946, Serial No. 681,333

an adjustable burette holder embodyirrgclamping means for the burette which is designed to yieldingly hold the burette against a plurality of spaced stationary abutments and to be displaceable for quick adjustment by a thumb latch.

The invention will become more apparent from a consideration of the accompanying drawing, constituting a part hereof, in which like reference characters designate like parts, and in which Fig. 1 is a front elevational view of a burette holder embodying the principles of this invention;

Fig. 2 is a side elevational view thereof; and

Fig. 3 a top plan view.

In the drawing the numeral I designates a base having a cylindrical tube 2 constituting a standard on which a clamping bracket 3 is mounted for sliding adjustment thereon. The bracket 3 is provided with a hollow lug 4 that envelops the tubular standard 2, as shown in Fig. 3, one portion of the lug being V-shaped, as shown at 5, and the strap portion having a threaded boss 6 for receiving the clamping screw 1. The clamping bracket is provided with studs 8 covered with rubber 9 and shaped to form a V-seat I!) for the burettes II, the burette engaging the top and bottom lugs 8 as shown in Fig. 2.

The burettes are held in abutting engagement with the lugs 8 by a clamping lock I2 which is a rubber covered stud member I3 mounted on a bell crank lever I4 pivoted on the clamping bracket 3 by screws I5. As shown in Fig. 1. the levers are provided with an arm I6 having a thumb lug I1, and the bracket 3 is shaped to form another arm I8 in alignment with the arm 16 of the clamp. The clamp arm I4 is normally urged in clamping en a ement with the burette I I by a coil spring I9 with the thumb lug I1 spaced away from the arm l8 as shown in Fig. 1. To adjust the burette and the clamp it is only necessary to engage the lug I! and arm I8 between the thumb and forefinger and bring them together, as shown in dotted lines. This compresses spring I 9 and moves the lever arm I4 away from the burette, through an arc in an upward direction, as shown by the dotted lines in Fig. 1. The burette may then be adjusted with the other hand, and when the thumb lug I1 is released the lug I2 effects intimate engagement of the burette II with the stationary members 8 to hold it in frictional engagement therewith.

As shown in the drawing, two of such burette clamping elements are provided on one mounting bracket and a symmetrical structure is available through the use of the single coil spring with the individual clamping lugs I1 for each of the clamp levers I4. The design lends itself to an inexpensive construction and to a convenient use in laboratory work.

Although one embodiment of the invention has been herein illustrated and described, it will be evident to those skilled in the art that various modifications may be made in the details of construction without departing from the principles herein set forth.

I claim:

1. In a burette holder, a clamping bracket mounted for sliding movement on a column, said bracket being of substantially yoke shape with a plurality of downwardly depending fingers and having arms for supporting abutments that are vertically spaced for engaging one side of a burette, a plurality of levers mounted on said bracket having arms extending beyond the vertically spaced abutments and each carrying a gripping member for engaging the opposite side of the burette, said levers having downwardly depending arms and thumb lugs in alignment with the downwardly depending arms of the bracket, and spiing means connecting said levers to each other whereby to normally bias each of said levers into abutting engagement with the burette, and normally maintain the depending lever arms and bracket arms in spaced relation for gripping engagement to displace either of the levers for releasing the burette.

2. In a burette holder, 2. base, a column extending on said base, a clamping bracket mounted on the column having clamping means for securing the bracket in adjusted position on said column, said bracket having a plurality of horizontally extending arms at the top thereof and a plurality of depending arms therebeneath, gripping members mounted on said arms in vertically spaced alignment, levers pivotally mounted on said bracket having arms extending substantially horizontally carrying a gripping abutment for engagement of a burette, spring means interconnecting the levers to normally bias them to gripping engagement with the burette to hold the latter against the vertically spaced gripping abutments, said levers having downwardly depending arms with thumb lugs and said bracket having downwardly depending arms in alignment with said lever arms to constitute with said thumb lugs gripping means forseparately releasing said levers out of engagement with the burette.

GUY H. BURRELL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,318,899 Morgan et a1 Oct. 14, 1919 1,826,474 Kohler Oct. 6, 1931 1,895,156 Fisher Jan. 24, 1933 2,216,886 Langelier Oct. 8, 1940 

